Abdominal exercise machine



FIG. 1 is a perspective view of our abdominal exercise machine;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 a top plan view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof, in an alternate position.

The broken line portions of the disclosure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an abdominal exercise machine, as shown and described herein. 